求翻译：High blood pressure coffee contains caffeine, it makes some sensitive patients with hypertension. If hyperkalemia in patients with renal failure, kidney failure situation, with the need to limit potassium diet, and high potassium content of coffee. Peptic ulcer caffeine to stimulate gastric acid secretion, relaxation of vascular smooth muscle so that the digestive system to speed up the metabolism of food, thereby reducing the nutritional value of food.是什么意思？

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